High-quality-factor　microspheres　with　smooth　surface　are　fabricated　through　surface　tension　by　heating　and　fusing　a　single　tapered　fiber　using　arc　of　electrodes　discharge.　Stimulated　Raman　scattering　of　the　third　order　nonlinear　phenomena　of　microspheres　with　high　power　density　whispering　gallery　modes　was　studied　by　coupling　976　nm　laser　into　microspheres　through　tapered　fiber　as　evanescent　wave.　The　total　six　cascaded　Raman　lasers　were　observed　in　the　experiment.　At　each　order,　single　longitudinal　mode　and　multi　longitudinal　mode　Raman　lasers　were　observed.　The　Raman　laser　at　around　1200　nm　was　measured　with　pump　power　less　than　582.6　μW.　The　sixth-order　Raman　laser　at　around　1287.04　nm　was　observed　when　pump　power　is　3.014　mW.　©　2013　Chinese　Physical　Society.